noun

• (medicine, countable) Initialism of electroencephalogram. [(neurology) A recording of electrical brain activity (brain waves) made by an electroencephalograph.]
• (medicine, countable) Initialism of electroencephalograph. [(neurology) An instrument used for recording of electrical brain activity.]
• (medicine) Initialism of electroencephalography. [(neurology) The measurement and recording of electrical activity in the brain for diagnostic purposes.]